Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70515e41ea4cd5609bc6759cb6b647866b789836c0d50c4b630fa0d48d208d4' 
  AND token = 'OqOLOcQFVQg23kiqZTBhitLS/fc5oeoLsGsnETdX+zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}